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The emergence of digital mobile broadband communication systems for voice, data, multimedia and positioning is coupled to the continuous progress of silicon CMOS-technology. Single chip integration with digital part, high integration density, low power consumption, low cost under mass production aspects and excellent RF performance are the current system design challenges. This paper focuses on design issues of classical RF-transceiver function blocks like LNAs, PAs, VCOs and mixers in context with multimode-/ multiband-SoC challenges. State of the art achievements are presented and an outlook on future RF-CMOS integration trends is given.